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I see what you mean now Peter, I was assuming you already had an Orion short tube 80 (st80) with your auto guider.
If you want to stack the ED 80 on your 9.25, then give Bintel a call to see if they make mounting blocks that fit 9.25, otherwise you will need to grab a set of mounting plates and bolt the ED on top like Sam said below.
I mounted a ST80 on my C8 using mounting blocks, they are much cheaper than plates ($35). You can see a photo of it on the show us your equipment thread.
Cheers, Bo
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